[Diy_efi] DIY WB 02 controller checkout problems

[rr]

Don't worry about tests 34 & 42. If they work then OK. If
they don't it doesn't mean anything except the offset is 
good.

BobR.


On Mon, 2 Sep 2002 20:13:18 -0500
 "Martin, Sam" <sam.martin at ieminc.com> wrote:
> Guys,
>    I have completed the controller. Got the connector
> from a junkyard (real
> easy to find), and have everything installed in a
> radioshack project box
> (actually looks really nice with the fuse, switch and LED
> mounted on the
> front). Should be ready to go, but cannot get it to check
> out according to
> www.diy-wb.com/diywbchk.htm 
> 
> If ya'll remember, I asked about the LM2902 earlier
> because the part number
> was unavailable from Digikey. Initially I installed the
> Texas Instrument
> chip (pn 296-6599-5-ND). Checkout procedure 42 would fail
> (voltage would not
> rise) and 34 was kind of flakey (voltage would not drop).
> Switched to pn
> LM2902NNS-ND. Everything seems to be OK with a few
> slightly off readings,
> but 34 and 42 are odd (but better than with the TI chip).
> Below is a
> breakdown of where I'm getting odd readings...
> (everything else checks out
> OK)
> 
> test 12 (U3 pin 5 to J12) supposed to be 7.9-8.0V, I see
> 7.75V
> test 13 (U3 pin 4 to J12) supposed to be 0V, I see 15.2mV
> test 15 (U2 pin 14 to J7) supposed to be 2.75V, I see
> 2.648
> test 21 (U2 pin 7 to J7)  supposed to be -3.4V, I see
> -3.329V
> test 23 (Q4 pin 3 t0 J7)  supposed to be -3.5V, I see
> -3.43V
> test 31 (U3 pin 1 to J7 switch closed)  supposed to be
> 4V, I see 3.864V
> test 33 (U2 pin 8 to J7 switch open) supposed to be 2.7V,
> I see 2.617V
> test 34 (U2 pin 8 to J7 switch closed) supposed to slowly
> go to -3.4V, I see
> an instant -3.9V
> test 42 (I used as 100 Ohm resistor)(J8 to to J12)
> supposed to start at 1.4V
> and rise slowly (1.25 min) to 4.1V, I see a start at 1.3V
> and a quick rise
> (~30 sec) to 4.3V.
> 
> I feel like I'm real close. Most of these probably don't
> matter. 34 & 42
> have me the most concerned.
> 
> Help???
> 
> Sam Martin
> 
> _______________________________________________
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